Sylvester's law of inertia

英美

abstract:

Sylvester's law of inertia is a theorem in matrix algebra about certain properties of the coefficient matrix of a real quadratic form that remain invariant under a change of coordinates. Namely, if A is the symmetric matrix that defines the quadratic form, and S is any invertible matrix such that D = SAST is diagonal, then the number of negative elements in the diagonal of D is always the same, for all such S; and the same goes for the number of positive elements.

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overheadsn. 企业的日常管理费用；杂项开支；一般费用（overhead 的复数）
outgoingsn. [会计]支出；开支（outgoing 的复数形式）
lockoutn. 闭厂，停工
linguisticsn. 语言学
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obstacle to对……的障碍
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in large quantities大量地